Because the U.S. had wanted to trade, but I believed the sovient refused. Or they wanted war, but U.S.A refused
Answer:
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
Adolf Hitler was Austrian.
The answer is Iron because the Iron Age lasted roughly from 1500 BCE to 500 BCE.
